This thread is for Firefox users. Since there are SO MANY extensions out there, I'd like to know what ones you use. I'm currently using:

• PDF Download
• Web Developer
• Search Status
• Customize Google
• SEO Links
• Minimize to Tray (oh I love this one )
• Performancing
• Flashblock

You guys? Any useful extension out there?

Here are some of my favorite Firefox extensions.

SiteAdvisor (I love this one)
Gmail Manager
Gmail File Space Extension (gspace)
Web Developer

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SysChat Free computer tech support

The siteadvisor extension is really useful, in particular when my mother uses the computer. Would be nice to have a block-sites capability too.

Im using:

IE View
Fasterfox
GMail Notifier
Image Zoom
Foxy Tunes
Media Player Connectivity
Pong
Chatzilla

but I have loads more I need to download....I broke my Firefox a while ago and never bothered to update it fully

I seem to have a lot of extensions that I like, but here are a few ones that I probably can't live without (well kind of...):

Adblock- I use it to block out all the adds that bother me!
Bugmenot- Used to sign into sites that require to sign up before continuing
Performancing- Used for blogging.
Gmail Skins- Used to customize the Gmail interface (and you get extra features such as smileys).
Minimize To tray- So that I can minimize firefox without closing it
User Agent Switcher- To get access sites that require IE even though they support Firefox.
Sage- I use this for all my RSS needs. And I use the hicks style (instead of using the Safari style)
Chatzilla- To chat...
Google Toolbar- To check page ranks and especially to check my spelling!
Gmail Notifier- To know about how many new emails I have...
Reveal/Showcase/Foxpose- For something like expose...
Web developer- To check CSS and to see if pages have errors
Image Zoom- To zoom into images
Site Advisor- To keep me free of spyware, spam, viruses and phishing (or online scams)
Tab mix plus- To help me manage my tabs.

And finally I like my Firefox search plug in that I created (which is sort of like an extension) to search SysChat and a few search plug ins to search other sites and a few Greasemonkey scripts.

Well i have pretty much all those listed, but as to not repeat here's a couple i really like to add:
answers - gives definitions of words with alt+click
all in one sidebar - a quick sidbar view for downloads, dialog menus, etc
download status bar - put all your downloads in a nice status bar inside FF
No Script - prevents any and all scripts from running (can be disabled on a page by page basis) this extension notifies you if a scritpt wants to run

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</Dream In Code>
-William. § (marvin_gohan)

I loved reading this thread because there were a few extensions I hadn't heard about until now.

I'm definitely downloading minimize to try, both at home and at work!

My favorites are pretty much already listed, except a couple. I'll be redundant and list 'em again, though.

NoScript - one of the best darn extensions around.
AdBlock Plus - better than regular ol' adblock, in my opinion.
Colourful Tabs - just to add color to the many, many tabs I always have open.
GMail Manager - can't live without this one!
StumbleUpon - assuming y'all know what StumbleUpon is, this is just a fun one to have!
IE View Lite - used only when I'm forced to examine a page in IE.